Which plumbing fixture requires a separate trap?

A floor sink requires a separate trap due to its unique design and function within a plumbing system. Floor sinks are typically installed in locations where drainage is essential for managing excess water, such as in commercial kitchens or laundry rooms. They are designed to collect liquid waste from various sources, including floor drains, and must have a trap to prevent sewer gases from entering the building.

The requirement for a separate trap is crucial because it isolates the floor sink's drainage from other fixtures, ensuring that any waste or odors do not interfere with the plumbing system of other connected fixtures. This is particularly important in maintaining hygiene and performance in commercial settings, where multiple types of water and waste may be present.

In contrast, kitchen sinks, bathroom sinks, and bathtubs often connect to a common drainage system, and their traps can be integrated or shared depending on the design of the plumbing. While these fixtures also need traps to function properly, the floor sink's specific application necessitates a dedicated trap to effectively manage drainage and prevent backflow or odor issues.